Hi
I use qwt-6.1(last svn updated to version 1825) with Qt5.2 on WindowsXP SP3
All things (include export documents as pdf & images ) seems to be good, except print.
Always a white paper come out from printer (or any external pdf printer such as pdfcreator).
You can check it by apply print in bode example.
Tanx in Advance
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